RADIO EVIDENCE FOR ELECTRON ACCELERATION IN A CUSP-LIKE STRUCTURE

Authors
Citation
A. Klassen, RADIO EVIDENCE FOR ELECTRON ACCELERATION IN A CUSP-LIKE STRUCTURE, Solar physics, 167(1-2), 1996, pp. 449-452
Citations number
12
Categorie Soggetti
Astronomy & Astrophysics
Journal title
ISSN journal
00380938
Volume
167
Issue
1-2
Year of publication
1996
Pages
449 - 452
Database
ISI
SICI code
0038-0938(1996)167:1-2<449:REFEAI>2.0.ZU;2-6
Abstract
In the spectrum of the type IV/II radio burst of 1994 July 18 we found a rare superposition of fast and slowly drifting features in the freq uency range 100-300 MHz about 1 min before the onset of the shock indu ced meter wave type II burst. We take this as signatures of the passag e of an MHD-like disturbance and the simultaneous injection of two con tradirected electron beams. These beams are manifested as an ordinary type Ill burst and a reverse drift burst starting at the same frequenc y. Remarkably, the reverse drift burst is visible only due to its abso rbtion trace in an underlying continuum patch. We argue that the super imposed burst features are emitted from a common source which covers t he top of a closed magnetic field structure and the immediately superp osed part (cusp) of the helmet streamer configuration. The radio sourc e is situated immediately at the electron acceleration site.